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Just dug them out of the parts bin.
Ill be, they are different! Just slightly, but the pistons are definitely different.
The thickness between the rings is thicker on the ’57 piston. Also, thickness from the top of the upper ring, to the top of the piston is thicker on the ’57 piston. Also has a touch more length on the skirt. Glancing at them, they look identical, until you hold them close side by side to compare. Funny as they have identical casting numbers inside them???
I cannot seem to see a difference between the rods, although they should be different as they have different part numbers, but cannot physically see any difference.
Ticked me off, but I guess I learned something today. Now to hunt for another powerhead to pull parts from!